Scratch and mealworms daily aren't good either. That's a lot of fat and takes away from the balanced diet of the crumbled feed.Diet hasn't changed. They forage morning & evening in the back yard. New Organics layer crumble with scratch & dried mealworms as a daily treat. All same for the last year. Apple Cider Vinegar in water in the summer. Now I'm scared of Mareks after seeing another feather loss post. I'm going to check her vent area & skin where feathers are really good before they roost. Her voice sounds normal but her breathing sounds like there is fluid like human crackles with pneumonia (sorry I'm a people nurse ) I do have a problem with wild birds getting into the run through the chicken wire. I didn't think about that when I built it. The coop smaller run is 1/4inch.
Did she just start the gurgling after you gave her the equimax?